Join Date: Jan 2012
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I am a firm believer in eying the wires that go to wastegate, fuel heater, IPR, ICP, etc..special attention to where the wires emerge from the protective sleeves and point of plug attachment.
I had a no start problem and was told camshaft sensor...replaced it and no go still...turns out it was multiple wiring breaks or almost breaks...resoldered and GO GO!
I had a similar problem to yours, once. Ran fine much of the time, but had a hitch that felt like a backfire/big miss. Power ebbed. Turns out it was the under the valve cover harness losing contact. There is a Ford fix for it...a clip that holds the harness tightly, I think.